docs: correct readthedocs.yml

.readthedocs.yml

@@ -2,16 +2,30 @@
 # Read the Docs configuration file
 # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
 
+# Required
 version: 2
 
+# Set the version of Python and other tools you might need
 build:
+  os: ubuntu-20.04
   tools:
     python: "3.9"
+    # You can also specify other tool versions:
+    # nodejs: "19"
+    # rust: "1.64"
+    # golang: "1.19"
 
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+   configuration: docs/source/conf.py
+
+# If using Sphinx, optionally build your docs in additional formats such as PDF
+# formats:
+#    - pdf
+
+# Optionally declare the Python requirements required to build your docs
 python:
-  install:
-    - requirements: docs/requirements.txt
-    - method: pip
-      path: .
+   install:
+   - requirements: docs/requirements.txt